<?php

if (!defined('BASEPATH'))
  exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
// ------------------------------------------------------------------------

/**
 * MySQL Utility Class
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_utility extends CI_DB_utility {

  /**
   * List databases
   *
   * @access	private
   * @return	bool
   */
  function _list_databases() {
    return "SHOW DATABASES";
  }

  // --------------------------------------------------------------------

  /**
   * Optimize table query
   *
   * Generates a platform-specific query so that a table can be optimized
   *
   * @access	private
   * @param	string	the table name
   * @return	object
   */
  function _optimize_table($table) {
    return "OPTIMIZE TABLE " . $this->db->_escape_identifiers($table);
  }

  // --------------------------------------------------------------------

  /**
   * Repair table query
   *
   * Generates a platform-specific query so that a table can be repaired
   *
   * @access	private
   * @param	string	the table name
   * @return	object
   */
  function _repair_table($table) {
    return "REPAIR TABLE " . $this->db->_escape_identifiers($table);
  }

  // --------------------------------------------------------------------
  /**
   * MySQL Export
   *
   * @access	private
   * @param	array	Preferences
   * @return	mixed
   */
  function _backup($params = array()) {
    if (count($params) == 0) {
      return FALSE;
    }

    // Extract the prefs for simplicity
    extract($params);

    // Build the output
    $output = '';
    foreach ((array) $tables as $table) {
      // Is the table in the "ignore" list?
      if (in_array($table, (array) $ignore, TRUE)) {
        continue;
      }

      // Get the table schema
      $query = $this->db->query("SHOW CREATE TABLE `" . $this->db->database . '`.`' . $table . '`');

      // No result means the table name was invalid
      if ($query === FALSE) {
        continue;
      }

      // Write out the table schema
      $output .= '#' . $newline . '# TABLE STRUCTURE FOR: ' . $table . $newline . '#' . $newline . $newline;

      if ($add_drop == TRUE) {
        $output .= 'DROP TABLE IF EXISTS ' . $table . ';' . $newline . $newline;
      }

      $i = 0;
      $result = $query->result_array();
      foreach ($result[0] as $val) {
        if ($i++ % 2) {
          $output .= $val . ';' . $newline . $newline;
        }
      }

      // If inserts are not needed we're done...
      if ($add_insert == FALSE) {
        continue;
      }

      // Grab all the data from the current table
      $query = $this->db->query("SELECT * FROM $table");

      if ($query->num_rows() == 0) {
        continue;
      }

      // Fetch the field names and determine if the field is an
      // integer type.  We use this info to decide whether to
      // surround the data with quotes or not

      $i = 0;
      $field_str = '';
      $is_int = array();
      while ($field = mysql_fetch_field($query->result_id)) {
        // Most versions of MySQL store timestamp as a string
        $is_int[$i] = (in_array(
                        strtolower(mysql_field_type($query->result_id, $i)), array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'), //, 'timestamp'),
                        TRUE)
                ) ? TRUE : FALSE;

        // Create a string of field names
        $field_str .= '`' . $field->name . '`, ';
        $i++;
      }

      // Trim off the end comma
      $field_str = preg_replace("/, $/", "", $field_str);


      // Build the insert string
      foreach ($query->result_array() as $row) {
        $val_str = '';

        $i = 0;
        foreach ($row as $v) {
          // Is the value NULL?
          if ($v === NULL) {
            $val_str .= 'NULL';
          } else {
            // Escape the data if it's not an integer
            if ($is_int[$i] == FALSE) {
              $val_str .= $this->db->escape($v);
            } else {
              $val_str .= $v;
            }
          }

          // Append a comma
          $val_str .= ', ';
          $i++;
        }

        // Remove the comma at the end of the string
        $val_str = preg_replace("/, $/", "", $val_str);

        // Build the INSERT string
        $output .= 'INSERT INTO ' . $table . ' (' . $field_str . ') VALUES (' . $val_str . ');' . $newline;
      }

      $output .= $newline . $newline;
    }

    return $output;
  }

}

/* End of file mysql_utility.php */
/* Location: ./system/database/drivers/mysql/mysql_utility.php */